| Variable Name | Explanation |
|---|---|
| bwt | Birth weight in grams. |
| low | Indicator if birth weight is less than 2.5 kg. |
| age | Mother's age in years. |
| lwt | Mother's weight in pounds at her last menstrual period. |
| race | Mother's race (1 = white, 2 = black, 3 = other). |
| smoke | Did the mother smoke during pregnancy? |
| ptl | Number of previous premature labours. |
| ht | Does the mother have a history of hypertension? |
| ui | Was there presence of uterine irritability? |
| ftv | Number of physician visits during the first trimester. |